/*
 * @BEGIN LICENSE
 *
 * Psi4: an open-source quantum chemistry software package
 *
 * Copyright (c) 2007-2024 The Psi4 Developers.
 *
 * The copyrights for code used from other parties are included in
 * the corresponding files.
 *
 * This file is part of Psi4.
 *
 * Psi4 is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * Psi4 is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along
 * with Psi4; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * @END LICENSE
 */

/*! \file
    \ingroup CCENERGY
    \brief Enter brief description of file here
*/
#include "Params.h"
#include "psi4/cc/ccwave.h"

#include "psi4/libpsi4util/PsiOutStream.h"
#include "psi4/libciomr/libciomr.h"
#include "psi4/libpsio/psio.h"
#include "psi4/libdpd/dpd.h"

#include <cstdio>
#include <cstdlib>

namespace psi {
namespace ccenergy {

void CCEnergyWavefunction::init_amps() {
    dpdfile2 tIA, tia, fIA, fia, dIA, dia;
    dpdbuf4 tIJAB, tijab, tIjAb, D, dIJAB, dijab, dIjAb;

    if (params_.ref == 0) { /** RHF **/

        global_dpd_->file2_init(&tIA, PSIF_CC_OEI, 0, 0, 1, "tIA");
        if (!params_.restart || !psio_tocscan(PSIF_CC_OEI, "tIA"))
            global_dpd_->file2_scm(&tIA, 0);
        else
            outfile->Printf("    Using old T1 amplitudes.\n");
        global_dpd_->file2_close(&tIA);

        if (!params_.restart || !psio_tocscan(PSIF_CC_TAMPS, "tIjAb")) {
            global_dpd_->buf4_init(&D, PSIF_CC_DINTS, 0, 0, 5, 0, 5, 0, "D <ij|ab>");
            global_dpd_->buf4_copy(&D, PSIF_CC_TAMPS, "tIjAb");
            global_dpd_->buf4_close(&D);

            global_dpd_->buf4_init(&tIjAb, PSIF_CC_TAMPS, 0, 0, 5, 0, 5, 0, "tIjAb");
            if (params_.local) {
                local_filter_T2(&tIjAb);
            } else {
                global_dpd_->buf4_init(&dIjAb, PSIF_CC_DENOM, 0, 0, 5, 0, 5, 0, "dIjAb");
                global_dpd_->buf4_dirprd(&dIjAb, &tIjAb);
                global_dpd_->buf4_close(&dIjAb);
            }
            global_dpd_->buf4_close(&tIjAb);
        } else
            outfile->Printf("    Using old T2 amplitudes.\n\n");
    } else if (params_.ref == 1) { /*** ROHF ***/
        if (!params_.restart || !psio_tocscan(PSIF_CC_OEI, "tIA") || !psio_tocscan(PSIF_CC_OEI, "tia")) {
            global_dpd_->file2_init(&fIA, PSIF_CC_OEI, 0, 0, 1, "fIA");
            global_dpd_->file2_copy(&fIA, PSIF_CC_OEI, "tIA");
            global_dpd_->file2_close(&fIA);
            global_dpd_->file2_init(&tIA, PSIF_CC_OEI, 0, 0, 1, "tIA");
            /*  dpd_oe_scm(&tIA, 0);  */
            global_dpd_->file2_close(&tIA);

            global_dpd_->file2_init(&fia, PSIF_CC_OEI, 0, 0, 1, "fia");
            global_dpd_->file2_copy(&fia, PSIF_CC_OEI, "tia");
            global_dpd_->file2_close(&fia);
            global_dpd_->file2_init(&tia, PSIF_CC_OEI, 0, 0, 1, "tia");
            /*  dpd_oe_scm(&tia, 0); */
            global_dpd_->file2_close(&tia);

            global_dpd_->file2_init(&tIA, PSIF_CC_OEI, 0, 0, 1, "tIA");
            global_dpd_->file2_init(&dIA, PSIF_CC_OEI, 0, 0, 1, "dIA");
            global_dpd_->file2_dirprd(&dIA, &tIA);
            global_dpd_->file2_close(&tIA);
            global_dpd_->file2_close(&dIA);

            global_dpd_->file2_init(&tia, PSIF_CC_OEI, 0, 0, 1, "tia");
            global_dpd_->file2_init(&dia, PSIF_CC_OEI, 0, 0, 1, "dia");
            global_dpd_->file2_dirprd(&dia, &tia);
            global_dpd_->file2_close(&tia);
            global_dpd_->file2_close(&dia);
        } else
            outfile->Printf("    Using old T1 amplitudes.\n");

        if (!params_.restart || !psio_tocscan(PSIF_CC_TAMPS, "tIjAb") || !psio_tocscan(PSIF_CC_TAMPS, "tIJAB") ||
            !psio_tocscan(PSIF_CC_TAMPS, "tijab")) {
            global_dpd_->buf4_init(&D, PSIF_CC_DINTS, 0, 2, 7, 2, 7, 0, "D <ij||ab> (i>j,a>b)");
            global_dpd_->buf4_copy(&D, PSIF_CC_TAMPS, "tIJAB");
            global_dpd_->buf4_copy(&D, PSIF_CC_TAMPS, "tijab");
            global_dpd_->buf4_close(&D);

            global_dpd_->buf4_init(&dIJAB, PSIF_CC_DENOM, 0, 1, 6, 1, 6, 0, "dIJAB");
            global_dpd_->buf4_init(&tIJAB, PSIF_CC_TAMPS, 0, 2, 7, 2, 7, 0, "tIJAB");
            global_dpd_->buf4_dirprd(&dIJAB, &tIJAB);
            global_dpd_->buf4_close(&tIJAB);
            global_dpd_->buf4_close(&dIJAB);

            global_dpd_->buf4_init(&dijab, PSIF_CC_DENOM, 0, 1, 6, 1, 6, 0, "dijab");
            global_dpd_->buf4_init(&tijab, PSIF_CC_TAMPS, 0, 2, 7, 2, 7, 0, "tijab");
            global_dpd_->buf4_dirprd(&dijab, &tijab);
            global_dpd_->buf4_close(&tijab);
            global_dpd_->buf4_close(&dijab);

            global_dpd_->buf4_init(&D, PSIF_CC_DINTS, 0, 0, 5, 0, 5, 0, "D <ij|ab>");
            global_dpd_->buf4_copy(&D, PSIF_CC_TAMPS, "tIjAb");
            global_dpd_->buf4_close(&D);

            global_dpd_->buf4_init(&dIjAb, PSIF_CC_DENOM, 0, 0, 5, 0, 5, 0, "dIjAb");
            global_dpd_->buf4_init(&tIjAb, PSIF_CC_TAMPS, 0, 0, 5, 0, 5, 0, "tIjAb");
            global_dpd_->buf4_dirprd(&dIjAb, &tIjAb);
            global_dpd_->buf4_close(&tIjAb);
            global_dpd_->buf4_close(&dIjAb);
        } else
            outfile->Printf("    Using old T2 amplitudes.\n");
    } else if (params_.ref == 2) { /*** UHF ***/

        if (!params_.restart || !psio_tocscan(PSIF_CC_OEI, "tIA") || !psio_tocscan(PSIF_CC_OEI, "tia")) {
            global_dpd_->file2_init(&fIA, PSIF_CC_OEI, 0, 0, 1, "fIA");
            global_dpd_->file2_copy(&fIA, PSIF_CC_OEI, "tIA");
            global_dpd_->file2_close(&fIA);
            global_dpd_->file2_init(&tIA, PSIF_CC_OEI, 0, 0, 1, "tIA");
            /*    dpd_file2_scm(&tIA, 0); */
            global_dpd_->file2_close(&tIA);

            global_dpd_->file2_init(&fia, PSIF_CC_OEI, 0, 2, 3, "fia");
            global_dpd_->file2_copy(&fia, PSIF_CC_OEI, "tia");
            global_dpd_->file2_close(&fia);
            global_dpd_->file2_init(&tia, PSIF_CC_OEI, 0, 2, 3, "tia");
            /*    dpd_file2_scm(&tia, 0); */
            global_dpd_->file2_close(&tia);

            global_dpd_->file2_init(&tIA, PSIF_CC_OEI, 0, 0, 1, "tIA");
            global_dpd_->file2_init(&dIA, PSIF_CC_OEI, 0, 0, 1, "dIA");
            global_dpd_->file2_dirprd(&dIA, &tIA);
            global_dpd_->file2_close(&tIA);
            global_dpd_->file2_close(&dIA);

            global_dpd_->file2_init(&tia, PSIF_CC_OEI, 0, 2, 3, "tia");
            global_dpd_->file2_init(&dia, PSIF_CC_OEI, 0, 2, 3, "dia");
            global_dpd_->file2_dirprd(&dia, &tia);
            global_dpd_->file2_close(&tia);
            global_dpd_->file2_close(&dia);
        } else
            outfile->Printf("    Using old T1 amplitudes.\n");

        if (!params_.restart || !psio_tocscan(PSIF_CC_TAMPS, "tIjAb") || !psio_tocscan(PSIF_CC_TAMPS, "tIJAB") ||
            !psio_tocscan(PSIF_CC_TAMPS, "tijab")) {
            global_dpd_->buf4_init(&D, PSIF_CC_DINTS, 0, 2, 7, 2, 7, 0, "D <IJ||AB> (I>J,A>B)");
            global_dpd_->buf4_copy(&D, PSIF_CC_TAMPS, "tIJAB");
            global_dpd_->buf4_close(&D);
            global_dpd_->buf4_init(&dIJAB, PSIF_CC_DENOM, 0, 1, 6, 1, 6, 0, "dIJAB");
            global_dpd_->buf4_init(&tIJAB, PSIF_CC_TAMPS, 0, 2, 7, 2, 7, 0, "tIJAB");
            global_dpd_->buf4_dirprd(&dIJAB, &tIJAB);
            global_dpd_->buf4_close(&tIJAB);
            global_dpd_->buf4_close(&dIJAB);

            global_dpd_->buf4_init(&D, PSIF_CC_DINTS, 0, 12, 17, 12, 17, 0, "D <ij||ab> (i>j,a>b)");
            global_dpd_->buf4_copy(&D, PSIF_CC_TAMPS, "tijab");
            global_dpd_->buf4_close(&D);
            global_dpd_->buf4_init(&dIJAB, PSIF_CC_DENOM, 0, 11, 16, 11, 16, 0, "dijab");
            global_dpd_->buf4_init(&tIJAB, PSIF_CC_TAMPS, 0, 12, 17, 12, 17, 0, "tijab");
            global_dpd_->buf4_dirprd(&dIJAB, &tIJAB);
            global_dpd_->buf4_close(&tIJAB);
            global_dpd_->buf4_close(&dIJAB);

            global_dpd_->buf4_init(&D, PSIF_CC_DINTS, 0, 22, 28, 22, 28, 0, "D <Ij|Ab>");
            global_dpd_->buf4_copy(&D, PSIF_CC_TAMPS, "tIjAb");
            global_dpd_->buf4_close(&D);
            global_dpd_->buf4_init(&dIJAB, PSIF_CC_DENOM, 0, 22, 28, 22, 28, 0, "dIjAb");
            global_dpd_->buf4_init(&tIJAB, PSIF_CC_TAMPS, 0, 22, 28, 22, 28, 0, "tIjAb");
            global_dpd_->buf4_dirprd(&dIJAB, &tIJAB);
            global_dpd_->buf4_close(&tIJAB);
            global_dpd_->buf4_close(&dIJAB);
        } else
            outfile->Printf("    Using old T2 amplitudes.\n");
    } else { /*** RHF/ROHF ***/
    }
}
}  // namespace ccenergy
}  // namespace psi
